Replicate zirconia material in blender-cycles (tooth material)
I've given a try to your tooth, basically it's a mix between a Diffuse and a Glossy node, then a bit of Subsurface Scattering to give it a bit of depth and transparency. Add a Noise Texture to give it a bit of bumps, scale it on the Z axis as the strias are rather vertical. You could also try a bit of Transluncency at the end if necessary.